DTC P010C00 – Mass Or Volume Air Flow (MAF)”B” Circuit Low Input
DTC P010C00 – Mass or Volume Air Flow (MAF) “B” Circuit Low Input.
✅ DTC P010C00 – MAF Sensor “B” Circuit Low Input
This code means the ECU is detecting a lower-than-expected signal voltage from the MAF Sensor “B” (many vehicles have two MAFs—one per bank, or an additional sensor before/after the air filter/duct).
Low input usually indicates the sensor is reading too little air flow or the signal wire is pulled low.
🔧 Possible Causes
1. Air Intake / Mechanical Issues
Dirty or clogged air filter
Intake duct leak after MAF sensor
Turbo boost leak (if turbocharged)
PCV hose leak
Blocked air duct or collapsed intake hose
2. MAF Sensor Issues
Dirty MAF sensing element
Faulty MAF sensor (weak signal output)
Wrong or cheap aftermarket MAF
3. Wiring / Electrical Issues
Signal wire shorted to ground
Open circuit in signal wire
Poor connector contact
Corrosion inside terminal
Sensor ground reference faulty
Low 5V reference supply (if applicable)
4. ECU / Software Issues
Rare—software update needed
ECU internal fault (very rare)
🧰 Step-by-Step Diagnostic Procedure
✅ 1. Visual Inspection
Check intake hoses for cracks, loose clamps.
Inspect air filter box for blockage.
Check if someone oiled the air filter (oil contaminates MAF).
Remove and inspect the MAF “B” sensor for contamination.
If dusty or oily → Clean with MAF cleaner only.
✅ 2. Check Live Data (Scanner)
Compare MAF A vs MAF B (if dual).
At idle, normal MAF values:
Petrol: 2–7 g/s
Diesel: 5–12 g/s
At 2500 rpm no load:
Petrol: 8–18 g/s
Diesel: 15–35 g/s
If MAF B is significantly lower → sensor or wiring fault
✅ 3. Check for Intake / Boost Leaks
Perform smoke test on intake system
Inspect turbo hoses, intercooler, clamps
Check PCV hoses for cracks
Even a small leak after the MAF causes a low reading.
✅ 4. Electrical Tests (Multimeter)
A. Check Power Supply
Most MAF sensors use:
12V or 5V supply
Ground
Signal (0.5–4.5V)
Key ON:
5V reference should be 4.8–5.1V
Ground should show <0.1V drop
B. Check Signal Voltage
At idle:
Normal: 0.8–1.2V (petrol)
Diesel: 1.0–1.5V
If signal is:
0–0.2V → short to ground
Very low voltage but not zero → bad sensor
✅ 5. Check Connector / Pins
Look for:
Green corrosion
Loose pins
Moisture entry
Oil saturation
Repair or replace terminals if needed.
✅ 6. Substitute a Known Good MAF (If Available)
If the reading improves → replace the sensor.
🔧 Common Fixes
Clean or replace air filter
Clean MAF sensor
Replace damaged intake hoses
Fix vacuum/boost leaks
Repair wiring (signal ground short)
Replace MAF sensor “B”
ECU reflash (rare)
🚗 Symptoms You May Notice
Low power
Turbo not boosting
Rough idle
Black smoke (diesel)
Poor fuel economy
Hesitation on acceleration
Stalling
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